diff options
| -rw-r--r-- | home/joypad.asm | 20 | ||||
| -rw-r--r-- | hram.asm | 23 |
2 files changed, 33 insertions, 10 deletions
diff --git a/home/joypad.asm b/home/joypad.asm index 80371b7..35e8086 100644 --- a/home/joypad.asm +++ b/home/joypad.asm @@ -3,6 +3,16 @@ INCLUDE "constants.asm" SECTION "Joypad functions", ROM0[$07FE] Joypad:: ; 7fe (0:7fe) +; Read the joypad register and translate it to something more +; workable for use in-game. There are 8 buttons, so we can use +; one byte to contain all player input. + +; Updates: + +; hJoypadUp: released this frame (delta) +; hJoypadDown: pressed this frame (delta) +; hJoypadState: currently pressed +; hJoypadSum: pressed so far ld a, [$d4ab] and $d0 ret nz @@ -28,22 +38,22 @@ Joypad:: ; 7fe (0:7fe) ld b, a ld a, (1 << 5 | 1 << 4) ; port reset ldh [rJOYP], a - ldh a, [hJoypadDown] + ldh a, [hJoypadState] ld e, a xor b ld d, a and e - ldh [hJoypadReleased], a + ldh [hJoypadUp], a ld a, d and b - ldh [hJoypadPressed], a + ldh [hJoypadDown], a ld c, a ldh a, [hJoypadSum] or c ldh [hJoypadSum], a ld a, b - ldh [hJoypadDown], a - ldh [hJoypadDown2], a + ldh [hJoypadState], a + ldh [hJoypadState2], a and $0f cp $0f jp z, Reset @@ -21,14 +21,27 @@ hVBlank:: ; ff99 ds 3 ; TODO -hJoypadReleased:: db ; ff9d -hJoypadPressed:: db ; ff9e -hJoypadDown:: db ; ff9f +hJoypadUp:: db ; ff9d +; Raw Joypad Up Event +; A pressed key was released +hJoypadDown:: db ; ff9e +; Raw Joypad Down Event +; An unpressed key was pressed +hJoypadState:: db ; ff9f +; Raw Joypad State +; State of all keys during current frame hJoypadSum:: db ; ffa0 +; Raw Joypad State Sum +; Sum of all keys that were pressed +; since hJoypadSum was last cleared - ds 5; TODO + ds 1; TODO +hJoyDown:: db ; ffa2 +hJoyState:: db ; ffa3 +hJoySum:: db ; ffa4 + ds 1; TODO -hJoypadDown2:: db ; ffa6 +hJoypadState2:: db ; ffa6 ds 8 ; TODO |